4. GP XII Limited is the general partner of GP XII, which is the managing member of XII Alternative, which is the general partner of Interholding. Mr. Macaulay is a director of the board of directors of GP XII Limited (the "Board") and has the right to appoint the majority of the directors of the Board.

5. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting persons are the beneficial owners of the reported securities for purposes of Section 16 or for any other purpose.

First Reserve GP XII Limited, by /s/ John P. Foley, as attorney-in-fact